21035242012 has 24 divisors (see below), whose sum is σ = 37387856016. Its totient is φ = 10353222528.

The previous prime is 21035242001. The next prime is 21035242021. The reversal of 21035242012 is 21024253012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356658 + ... + 411430.

It is an arithmetic number, because the mean of its divisors is an integer number (1557827334).

Almost surely, 2^21035242012 is an apocalyptic number.

It is an amenable number.

21035242012 is a deficient number, since it is larger than the sum of its proper divisors (16352614004).

21035242012 is a wasteful number, since it uses less digits than its factorization.

21035242012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56277 (or 56275 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21035242012 its reverse (21024253012), we get a palindrome (42059495024).

The spelling of 21035242012 in words is "twenty-one billion, thirty-five million, two hundred forty-two thousand, twelve".